part ofectoderm-derived structurestructure with developmental contribution from neural crestmeningeal dura materzone of organdiaphragma sellaeFMA:78540The diaphragma sellae or sellar diaphragm is the circular fold of dura mater that almost completely roofs the fossa hypophyseos in the sphenoid bone of the skull. It retains the pituitary gland in the fossa hypophyseos, with only the infundibulum of the pituitary gland passing through it.UBERON:0035416sellar diaphragmuberon